Discord Voice API

asyncapi: 2.6.0
info:
  title: Discord Voice API
  version: '10'
  description: >-
    The Discord Voice API provides the protocol for establishing and managing
    voice connections between clients and Discord voice servers. It handles
    UDP-based voice data transmission, encryption with XSalsa20-Poly1305,
    and supports features like speaking indicators and voice state updates.
    The voice connection lifecycle begins via the main Gateway with Opcode 4
    (Update Voice State) and continues with a dedicated voice WebSocket.
  contact:
    name: Discord Support
    url: https://support-dev.discord.com/hc/en-us
    email: support@discord.com
  license:
    name: MIT
  externalDocs:
    description: Discord Voice Connections Documentation
    url: https://discord.com/developers/docs/topics/voice-connections
servers:
  voice:
    url: wss://{voice_server_hostname}/?v=8
    protocol: wss
    description: Discord Voice WebSocket server (endpoint provided via VOICE_SERVER_UPDATE)
    variables:
      voice_server_hostname:
        description: Voice server hostname from VOICE_SERVER_UPDATE event
channels:
  /:
    publish:
      operationId: sendVoiceMessage
      summary: Send message to voice server
      description: Messages sent from the client to the Discord voice server
      message:
        oneOf:
          - $ref: '#/components/messages/VoiceIdentify'
          - $ref: '#/components/messages/SelectProtocol'
          - $ref: '#/components/messages/VoiceHeartbeat'
          - $ref: '#/components/messages/Speaking'
          - $ref: '#/components/messages/VoiceResume'
    subscribe:
      operationId: receiveVoiceEvent
      summary: Receive events from voice server
      description: Events received from the Discord voice server
      message:
        oneOf:
          - $ref: '#/components/messages/VoiceReady'
          - $ref: '#/components/messages/SessionDescription'
          - $ref: '#/components/messages/VoiceHeartbeatAck'
          - $ref: '#/components/messages/VoiceHello'
          - $ref: '#/components/messages/VoiceResumed'
          - $ref: '#/components/messages/ClientDisconnect'
components:
  messages:
    VoiceIdentify:
      name: VoiceIdentify
      title: Voice Identify (Opcode 0)
      summary: Begin a voice WebSocket connection
      payload:
        type: object
        required:
          - op
          - d
        properties:
          op:
            type: integer
            const: 0
          d:
            type: object
            required:
              - server_id
              - user_id
              - session_id
              - token
            properties:
              server_id:
                type: string
                description: Guild ID or channel ID for DM calls
              user_id:
                type: string
              session_id:
                type: string
                description: Session ID from the main Gateway READY event
              token:
                type: string
                description: Voice token from VOICE_SERVER_UPDATE
    SelectProtocol:
      name: SelectProtocol
      title: Select Protocol (Opcode 1)
      summary: Select the voice protocol and provide connection details
      payload:
        type: object
        required:
          - op
          - d
        properties:
          op:
            type: integer
            const: 1
          d:
            type: object
            required:
              - protocol
              - data
            properties:
              protocol:
                type: string
                enum:
                  - udp
              data:
                type: object
                required:
                  - address
                  - port
                  - mode
                properties:
                  address:
                    type: string
                    description: External IP discovered via IP Discovery
                  port:
                    type: integer
                    description: External port discovered via IP Discovery
                  mode:
                    type: string
                    description: Encryption mode
                    enum:
                      - aead_aes256_gcm_rtpsize
                      - aead_xchacha20_poly1305_rtpsize
                      - xsalsa20_poly1305_lite
                      - xsalsa20_poly1305_suffix
                      - xsalsa20_poly1305
    VoiceHeartbeat:
      name: VoiceHeartbeat
      title: Voice Heartbeat (Opcode 3)
      summary: Sent periodically to maintain the voice connection
      payload:
        type: object
        required:
          - op
          - d
        properties:
          op:
            type: integer
            const: 3
          d:
            type: integer
            description: Nonce value (timestamp)
    Speaking:
      name: Speaking
      title: Speaking (Opcode 5)
      summary: Indicate speaking status
      payload:
        type: object
        required:
          - op
          - d
        properties:
          op:
            type: integer
            const: 5
          d:
            type: object
            required:
              - speaking
              - delay
              - ssrc
            properties:
              speaking:
                type: integer
                description: >-
                  Bitfield: 1=Microphone, 2=Soundshare, 4=Priority
              delay:
                type: integer
              ssrc:
                type: integer
                description: Synchronization Source identifier
    VoiceResume:
      name: VoiceResume
      title: Voice Resume (Opcode 7)
      summary: Resume a voice connection
      payload:
        type: object
        required:
          - op
          - d
        properties:
          op:
            type: integer
            const: 7
          d:
            type: object
            required:
              - server_id
              - session_id
              - token
            properties:
              server_id:
                type: string
              session_id:
                type: string
              token:
                type: string
    VoiceReady:
      name: VoiceReady
      title: Voice Ready (Opcode 2)
      summary: Voice server is ready, provides connection information
      payload:
        type: object
        properties:
          op:
            type: integer
            const: 2
          d:
            type: object
            properties:
              ssrc:
                type: integer
                description: SSRC for this connection
              ip:
                type: string
                description: Voice server IP
              port:
                type: integer
                description: Voice server UDP port
              modes:
                type: array
                items:
                  type: string
                description: Available encryption modes
    SessionDescription:
      name: SessionDescription
      title: Session Description (Opcode 4)
      summary: Voice session description with encryption details
      payload:
        type: object
        properties:
          op:
            type: integer
            const: 4
          d:
            type: object
            properties:
              mode:
                type: string
                description: Selected encryption mode
              secret_key:
                type: array
                items:
                  type: integer
                description: 32-byte secret key for encryption
    VoiceHeartbeatAck:
      name: VoiceHeartbeatAck
      title: Voice Heartbeat ACK (Opcode 6)
      summary: Acknowledgment of a voice heartbeat
      payload:
        type: object
        properties:
          op:
            type: integer
            const: 6
          d:
            type: integer
            description: Nonce echoed back
    VoiceHello:
      name: VoiceHello
      title: Voice Hello (Opcode 8)
      summary: Received after connecting, contains heartbeat interval
      payload:
        type: object
        properties:
          op:
            type: integer
            const: 8
          d:
            type: object
            properties:
              heartbeat_interval:
                type: number
                description: Heartbeat interval in milliseconds
    VoiceResumed:
      name: VoiceResumed
      title: Voice Resumed (Opcode 9)
      summary: Voice connection successfully resumed
      payload:
        type: object
        properties:
          op:
            type: integer
            const: 9
    ClientDisconnect:
      name: ClientDisconnect
      title: Client Disconnect (Opcode 13)
      summary: A user disconnected from the voice channel
      payload:
        type: object
        properties:
          op:
            type: integer
            const: 13
          d:
            type: object
            properties:
              user_id:
                type: string